| Bleed valve |
| M545i | I have a 745i engine in my E28 track car, it is the 3.4 motor with the "old" intake and ECU and L-jetronic. The cam is modified to support the old ignition system.
I have now installed a bleed valve (3 way) onto the pressure tube from turbo to wastegate since I only reached 0,3bar boost. I suppose that this is because I have the "newer" turbo + wastegate.
Now my question is: is this a good solution or should I modify the wastegate or go with a turbo valve (spring+ball) to have a better result? I am now running at 0,6bar pressure and the car feels strong but anything that would spool up faster the turbo gets my attention. ps I don't have the money for major modifications!
Thanks much,
M545i |
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| Jens | You should be pulling more,
I would check all hoses and or leakage
from the system first.
Sincerely Jens
Sincerely Jens |
| scottie | The turbo should kick you in the butt when boost exceeds 6 lbs. Do you have a mixture meter hooked up? By the way, I want to modify my e28 with a turbo motor. Did you have to make any special motor mounts? What kind of exhaust are you running?
Scottie Sharpe
Sysop
84 745i
85 535i |
| M545i | Ok, I've put it little wrong here, the car pulls really very strong!!! I have the feeling that if I would go to 0.9 or 1bar something will break or must break (maybe the 5 speed or the diff or the cardans)during acceleration. On the track I have so far had problems with outcornering I cannot use the power, the weels keep on spinning even in 4th (I've now put the 3.07LSD in, should be betterthe 3.45 open). There was a new Porsche non-turbo I guess, I was helding him up before the turns so I let him pass but then....on the straight I kept just next to him, was he surprised!!!!
The thing is, is a bleedvalve the best way to go for my engine or do I need a turbo pressure valve that opens to the wastegate when reached like 0.6 or whatever pressure?
Scottie, I needed to make the exhaust side motor mount and reroute the exhaust downpipes + intercooler tubing. Other things are straight forward, besides wiring. My exhaust is from both turbo and wastegate downpipes to the X then two straight 2.2inch pipes to the rear where I put half of the 745i end muffler (because free flow) to keep the sound not too loud (we have limit max. 95dB on track).
M545i
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